30-year climate normals

Whitman County Climate and Weather Averages

Hottest month — August

83.4°

average daily high. The coldest month is December, averaging a low of 26.9°F.

Whitman County gets 17.53" of precipitation a year, and 37% of it falls in Nov, Dec, Jan.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	37.6°	27.8°	2.15"
February	41.6°	29.2°	1.59"
March	49.3°	32.9°	1.95"
April	56.4°	37.2°	1.79"
May	65.4°	43.7°	1.41"
June	71.9°	47.7°	1.17"
July	83.1°	50.9°	0.39"
August	83.4°	50.4°	0.49"
September	74.2°	45.4°	0.65"
October	59.2°	37.6°	1.59"
November	44.7°	32.5°	2.14"
December	36.6°	26.9°	2.21"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 37% falling in the wettest three months (Nov, Dec, Jan).

January 2.15"

February 1.59"

March 1.95"

April 1.79"

May 1.41"

June 1.17"

July 0.39"

August 0.49"

September 0.65"

October 1.59"

November 2.14"

December 2.21"

Annual total 17.53"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 284

Heating degree days How much heating the climate demands 6,253

Approximate annual cooling cost At 14.95¢/kWh, Washington average $42

Approximate annual electric heating cost Lower where heating is gas rather than electric $327

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Whitman County, where electricity is one line of eight.

Common questions

What is the weather like in Whitman County?

Whitman County averages a high of 83.4°F in August and a low of 26.9°F in December. Annual precipitation is 17.53 inches, with essentially no snow.

When is the rainy season in Whitman County?

The wettest stretch is Nov, Dec, Jan, which accounts for 37% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Whitman County?

The average daily high in August, the hottest month, is 83.4°F. That drives 284 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Whitman County?

Effectively no. Measurable snowfall is rare in Whitman County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station PULLMAN MOSCOW RGNL AP, WA US (USW00094129), 23.1 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Washington residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.